Miele PG 8504 Operating Instructions Manual page 33

 Do not fill the reservoir with water.
The reservoir could overflow when filled with salt.
Add salt only until the funnel of the salt reservoir is full, so that it
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can close properly. Do not add more than 2 kg of salt.
As the salt reservoir is being filled, displaced water (saline solution)
may run out.
Clean any excess salt from the area around the salt reservoir and
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especially from the seal. Do not use running water as this can
cause the salt reservoir to overflow.
Close the funnel.
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Run the programme after refilling salt.
Rinsing
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This will ensure that any traces of salt and saline solution are
dissolved and rinsed away.
Salt and saline solution which has overflowed can cause corrosion
damage if they are not rinsed away.
Water softener
33